Do you want to limit what applications can be used on your system? Application Locker is a simple program that prevents specified programs from being opened.
Application Locker is really useful for parents who want to restrict their children's use of your computer, or just to keep certain programs out of reach of other users. It's limited to locking .EXE files, so you can't use it to lock the control panel, which is a shame. However, things like Firefox and IE can easily be locked, restricting internet access.
There is no security on Application Locker, so anyone who opens it can unlock locked programs. However, if you install it with administrator rights on your PC, and set it to be only usable by an administrator, it will be effective.
As a way to flag to users that they shouldn't be using a certain application, this does the trick. It comes with a help PDF, although this is quite uninformative! To add an application to the lock list, you just need to paste in the .EXE filename, which is not difficult, but you can't search for applications to add.
For the security conscious, Application Locker is a simple way to keep certain programs out fo bounds.